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Seeking help

Dear  all

        Recently,we& nbsp; have  a  problem  with  our  robot(M94A 4400).   Hope all  can  hlep me. The error messeage  that shows on the teach pendant:

Error:

eiotrg.c  765  EIOTRG: Error >-603 :  Input  remove   parameters   invalid 

        Then  we  press the function key "OK",the robot can work  normally.  In addtion,the robot died sometime for no reason. 

        Is it  the system  error?  whether or not  install the  system?

thanks!

                                                                                 semircn